The Resistor Guide is the most complete educational overview about resistors. It explains all resistor types, properties and background theory. It is complemented by practical examples and overviews of relevant standards and formula's.
AMSER (the Applied Math and Science Education Repository) is a portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use. AMSER is funded by the National Science Foundation (NSF) as part of the National Science Digital Library, and is being created by a team of project partners led by Internet Scout.